Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee, UK.
Environ Microbiol. 2012 Jul;14(7):1744-53. doi: 10.1111/j.1462-2920.2012.02776.x. Epub 2012 May 16.
The ability of the soil fungi Aspergillus niger and Serpula himantioides to tolerate and solubilize manganese oxides, including a fungal-produced manganese oxide and birnessite, was investigated. Aspergillus niger and S. himantioides were capable of solubilizing all the insoluble oxides when incorporated into solid medium: MnO(2) and Mn(2) O(3) , mycogenic manganese oxide (MnO(x) ) and birnessite [(Na(0.3) Ca(0.1) K(0.1) )(Mn(4+) ,Mn(3+) )(2) O(4) ·1.5H(2) O]. Manganese oxides were of low toxicity and A. niger and S. himantioides were able to grow on 0.5% (w/v) of all the test compounds, with accompanying acidification of the media. Precipitation of insoluble manganese and calcium oxalate occurred under colonies growing on agar amended with all the test manganese oxides after growth of A. niger and S. himantioides at 25°C. The formation of manganese oxalate trihydrate was detected after growth of S. himantioides with birnessite which subsequently was transformed to manganese oxalate dihydrate. Our results represent a novel addition to our knowledge of the biogeochemical cycle of manganese, and the roles of fungi in effecting transformations of insoluble metal-containing compounds in the environment.
研究了土壤真菌黑曲霉和蛇皮管菌对锰氧化物的耐受和溶解能力，包括真菌产生的锰氧化物和水钠锰矿。当黑曲霉和蛇皮管菌被掺入固体培养基中时，它们能够溶解所有不溶性氧化物：MnO 2 和 Mn 2 O 3 、真菌产生的锰氧化物（MnO(x) ）和水钠锰矿[（Na(0.3) Ca(0.1) K(0.1) ）(Mn(4+),Mn(3+) )(2) O(4) ·1.5H(2) O]。锰氧化物的毒性较低，黑曲霉和蛇皮管菌能够在所有测试化合物的 0.5%（w/v）浓度下生长，同时使培养基酸化。在黑曲霉和蛇皮管菌在 25°C 下生长后，琼脂中添加所有测试锰氧化物的培养基上的菌落下会发生不溶性锰和草酸钙的沉淀。在蛇皮管菌生长后，检测到了三水合草酸锰的形成，随后水钠锰矿转化为二水合草酸锰。我们的研究结果为我们对锰的生物地球化学循环以及真菌在影响环境中不溶性含金属化合物转化方面的作用的认识提供了新的补充。
